Deep Geothermal Structures of Potential Hot Dry Rock Resources Area in China

Hot dry rock as a new kind of alternative resources which can be developed based on the establishment of enhanced geothermal system(EGS)has been confirmed to be tremendous in total amount.The demonstration project is urgent both for our forefront and basic work.As in all of the other EGS projects,geothermal reservoir temperature should be considered before any other factors.The three dimensional temperature models were established in target demonstration area based on the new terrestrial heat flow and depth of Curie interface map.The result shows at the depth of 4km,165℃ can be reached in the southeast coast of China and 380℃ could be reached at the same depth in the area nearby Qinghai-Tibet Railway.The simulation results and measured data were compared to illustrate the different heat formation mechanisms of the two areas.Zhangzhou in the southeast coast of China presents the major crust heat production with the thickness of radioactive concentration layer reaching 10 km,and mantle heat occupying 39.6%in the total heat flow.In contrast,Yangbajing which lies nearby the Qinghai-Tibet Railway shows more mantle heat flow which could occupy 53.7%in the whole heat flow with the thickness of radioactive concentration layer reaching 6km.The result of the model has a higher consistency with the historical testing and so the data could be used as the reference of EGS project site selection.